fix for missing redraw in own commit r55554 (Ctrl+F text editor find).
since an event wasn't added to the queue no redraws we're done when the panel was already open, instead use a notifier.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55575 954f8c5b-7b00-dc11-b283-0030488c597c